Symptoms
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Possible Causes
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Remedy
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Coolant leakage
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| •
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From the bleed hole of the water pump
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Visually check
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| •
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Check leaks after about ten-minute warming up.
|
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| •
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If coolant still leaks, replace a water pump.
|
|
| •
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If leakage stops, reuse the water pump (Do not replace the pump
with a new one).
|
|
|
|
| •
|
Check the tightening of the water pump mounting bolts.
|
|
| •
|
Retighten the mounting bolts.
|
|
| •
|
Check damage of gaskets or inflow of dust.
|
|
| •
|
Replace the gasket and clean dust off.
|
|
| •
|
From outer surface of water pump
|
|
| •
|
Check the material or any cracks of the water pump.
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|
| •
|
Poor material. If any crack found, replace the water pump.
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|
Noise
|
|
Inspection with a stethoscope
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| •
|
After starting the engine, check noise with a stethoscope.
|
|
| •
|
If there is no noise, reuse the water pump(do not replace it).
|
|
| •
|
If there is any noise from the water pump, remove the drive
belt and recheck.
|
|
Inspection after removing a drive belt
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| •
|
After removing a water pump and a drive belt, check noise again.
|
|
| •
|
If there is noise, reuse the water pump. Check other drive line
parts.
|
|
| •
|
If there is no noise, replace the water pump with a new one.
|
|
Inspection after removing a water pump
|
| •
|
After removing a water pump and a drive belt, check noise again.
|
|
| •
|
If there is any interference between them, replace the water
pump with a new one.
|
|
Overheating
|
|
Loosened impeller
|
| •
|
Corrosion of the impeller wing
|
|
| •
|
Poor coolant quality / Maintenance check
|
|
| •
|
Impeller seperation from the shaft
|
|
| •
|
Replace the water pump.
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|
Water pump. Repair procedures
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